An ephemeral Option for Rust. When created, this EphemeralOption takes an expiry time and a value, and the EphemeralOption will revert to None after the time runs out.

Example

use ephemeropt::EphemeralOption;

let mut num_opt = EphemeralOption::new(0, std::time::Duration::from_secs(1));
// Will only go up to 10, because every other call will be cached
for _ in 0..=20 {
    match num_opt.get() {
        Some(&num) => println!("{num}"),
        None => {
            let prev_num = num_opt.get_expired().unwrap();
            let num = num_opt.insert(prev_num + 1);
            println!("{num}");
        }
    }
    std::thread::sleep(std::time::Duration::from_millis(500));
}

EphemerOpt

An ephemeral Option for Rust. When created, this EphemeralOption takes an expiry time and a value, and the EphemeralOption will revert to None after the time runs out.

This can be useful for possibly caching values instead of rerunning an expensive computation to get them. See the examples for a real-world demonstration of this using CPU data and message passing.